1. First results on the SPS beam collimation with bent crystals
- Author
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G. Robert-Demolaize, D. Lietti, Donato Vincenzi, A. G. Afonin, Enrico Bagli, M. Oriunno, V. Mascagna, F. Murtas, Roberto Losito, M. Silari, Andrea Mazzolari, A. Lombardi, R W Assmann, Vincenzo Guidi, V.M. Suvorov, Andrea Mattera, N.V. Mokhov, Emanuele Laface, Davide Bolognini, Gianantonio Della Mea, V.A. Maisheev, V. Ippolito, Yu. A. Chesnokov, D. De Salvador, R. Santacesaria, W. Scandale, I. A. Yazynin, S. Hasan, A. D. Kovalenko, L.P. Lapina, Chiara Bracco, Yu. M. Ivanov, Paolo Valente, S. Baricordi, G. Cavoto, V. Previtali, L. Ludovici, Sergey Vavilov, L.G. Malyarenko, Stefano Redaelli, E. Vallazza, Simone Gilardoni, A. M. Taratin, Yu.A. Gavrikov, Pietro Dalpiaz, Gianluigi Arduini, A.S. Denisov, Elias Metral, Alessandro Masi, M. Prest, L. Tlustos, Daniele Mirarchi, V.V. Skorobogatov, T. W. Markiewicz, and D. Still
- Subjects
Nuclear and High Energy Physics ,Physics::Instrumentation and Detectors ,Bent molecular geometry ,Accelerator ,Extraction ,SPS ,Beam collimation ,Channeling ,Crystal ,Collimated light ,law.invention ,Nuclear physics ,bent crystal LHC ,Optics ,law ,Medipix ,Nuclear Experiment ,Collimation ,Physics ,business.industry ,Particle accelerator ,Collimator ,Physics::Accelerator Physics ,Halo ,business ,Beam (structure) - Abstract
Experiments were performed at the CERN SPS with 120 GeV/c stored proton beams to assess the possibility of beam halo collimation assisted by bent crystals. A bent crystal was used to deflect horizontally by an angle of about 170 mu rad the beam halo protons in channeling states directing them into a 60 cm long tungsten absorber. The halo loss rate due to nuclear inelastic interactions of protons in the aligned crystal was up to five times smaller than for its amorphous orientation. Channeled fractions, (75 +/- 4)% and (85 +/- 5)% for the two tested silicon crystals, were measured by intercepting the deflected beam with another collimator located between the crystals and the absorber. The pixel detector (MEDIPIX) installed in a Roman pot inside the beam pipe was used to obtain visual images of the deflected beam. (C) 2010 Elsevier B.V. All rights reserved.
- Published
- 2010